How can PHP developers efficiently convert a string to uppercase in a new variable?

To convert a string to uppercase in PHP, developers can use the `strtoupper()` function. This function takes a string as input and returns the string with all characters converted to uppercase. To store the uppercase string in a new variable, developers can simply assign the result of `strtoupper()` to the new variable. 

$string = "hello world";
$uppercaseString = strtoupper($string);
echo $uppercaseString; // Output: HELLO WORLD

Keywords

PHP string uppercase variable conversion

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